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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Fine-grained channel margin deposits in a typical gravel bed river spatial and temporal controls on the distribution, quantity, and residence time and implications for centennial-scale sediment and mercury cycling /

Skalak, Katherine Joanne. January 2009 (has links)
Thesis (Ph.D.)--University of Delaware, 2009. / Principal faculty advisor: James E. Pizzuto, Dept. of Geological Sciences. Includes bibliographical references.
2

Spatio-temporal effects of fine sediment dynamics on invertebrate assemblages in a river experiencing high fine sediment loads

Buendía Forés, Cristina January 2013 (has links)
This thesis aims to assess the response of invertebrate assemblages to fine sediment in the River Isábena, a catchment generating unusually high sediment loads due to the presence of badland areas. First, a spatial approach was taken in order to assess evidence of sedimentrelated patterns in invertebrate assemblages across the catchment under stable flow conditions. This provided a “snap‐shot” of the spatial variability on the assemblages in relation to sediment stored in the channel, as well as the relative influence of physical habitat conditions of different spatial scales. Fine sediment proved to be driving invertebrate assemblages distribution, structure and trait composition, filtering‐out sensitive species and thus promoting nested patterns across the catchment. Strong interactions between spatial scales were found, emphasizing the existence of catchment scale controls (such as geology and rainfall) on reach physical habitat conditions and, in turn, on invertebrate assemblages distribution. This spatial approach was complemented with the study of the temporal dynamics, which focussed on understanding the dominant drivers in the catchment hydrosedimentary behaviour and the relationship between physical processes and the ecological response. Temporal distribution of rainfall (and thus the occurrence of floods), along with the sediment availability (both in the source and in the channel) were driving the intra‐annual suspended sediment dynamics. Turnover of invertebrate assemblages was jointly driven by taxon life cycles and the temporal dynamics in hydrosedimentary conditions (i.e. occurrence of floods and episodes of high sedimentation). Despite the intra‐annual variability, assemblages proved to be resilient, most likely as a result of the selection of pre‐adapted traits. Overall, these findings emphasize the importance of assessing the geomorphological and hydrological processes that control sediment production, delivery and permanence in the channel, in order to better understand the ecological impacts of excessive fine sediment loads.
3

From gravel to sand : downstream fining of bed sediments in the lower river Rhine /

Frings, Roy. January 2007 (has links)
Univ., Diss.--Utrecht, 2007.
4

Alluvial architecture of the Holocene Rhine-Meuse delta (the Netherlands) and the Lower Mississippi Valley (U.S.A.) /

Gouw, Marc. January 2007 (has links)
Thesis (Ph. D.)--Utrecht University, 2007. / One folded col. plate of geological sections in pocket. Vita. Includes bibliographical references.
5

Alluvial architecture of the Holocene Rhine-Meuse delta (The Netherlands) and the Lower Mississippi Valley (U.S.A.) /

Gouw, Marc Jean Pierre. January 2007 (has links)
Univ., Diss.--Utrecht, 2007.
6

The effects of urbanization on the streambed sediment characteristics in a ridge and valley watershed /

Thames, Brantley Allison, January 2005 (has links) (PDF)
Thesis (M.S.) -- University of Tennessee, Knoxville, 2005. / Title from title page screen (viewed on July 5, 2005). Thesis advisor: John S. Schwartz. Document formatted into pages (x, 146 p. : col. ill., maps (some col.)). Vita. Includes bibliographical references (p. 84-89).
7

Denitrification in sediments of headwater streams in the southern Appalachian Mountains, USA /

Martin, Lara A., January 2000 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 2000. / Includes bibliographical references (leaves 20-23).
8

A holocene sand budget for the seasonally wet tropics region of north Queensland /

Dalla Pozza, Ramona Imelda. January 2005 (has links)
Thesis (Ph.D.) - James Cook University, 2005. / Typescript (photocopy) Bibliography: leaves 164-175.
9

Measuring the effects of increasing loads of fine sediment from timber harvest and road building on aquatic populations of Dicamptodon tenebrosus (pacific giant salamander) in California's redwoods /

Pogue, Seth. January 1900 (has links)
Thesis (M.A.)--Humboldt State University, 2008. / Includes bibliographical references (leaves 48-55). Also available via Humboldt Digital Scholar.
10

Evaluation of sediment trap efficiency in an estuarine environment /

Stoddard, Daniel Mark. January 2001 (has links)
Thesis (M.S. in Coastal Engineering)--University of Florida, Dept. of Civil and Coastal Engineering, 2001. / Includes bibliographical references (leaves 40-42). Also available online.

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